Risk Factors Associated with Hospitalized Severe Respiratory Syncytial Virus Lower Respiratory Tract Infection in children Under 5 Years at Pranangklao Hospital
Keywords:
severe respiratory syncytial virus (rsv), lower respiratory tract infection (lrti), severe rsv-lrti, clinical respiratory score (crs)Abstract
Objective: To investigate risk factors associated with hospitalized severe respiratory syncytial virus lower respiratory tract infection in children under 5 years and to determine the rates of intubation with mechanical ventilation, Heated Humidified High Flow Nasal Cannula (HHFNC) use, pediatric intensive care unit (PICU) admitted, and mortality. Methods: This retrospective analytic cross-sectional study reviewed medical records and electronic databases of hospitalized children diagnosed with RSV-LRTI at Pranangklao Hospital between January 1, 2024 and December 31, 2025. A total of 356 patients were included. Factors associated with severe RSV-LRTI were analyzed using logistic regression analysis. Results: A total of 356 children under five years of age with RSV-LRTI were included. Most patients were male, with a median age of 15.9 months. RSV outbreaks occurred predominantly during the rainy season through early winter. RSV pneumonia was the most common diagnosis 84.3%. Severe RSV-LRTI was identified 21.6% of patients. Respiratory support was required in 59.0% of cases, while PICU admitted occurred in 4.8%. No in-hospital mortality. Factors associated with severe RSV-LRTI included age <3 months (ORAdj=8.7, 95% CI: 3.3–23.1), Preterm (ORAdj=3.0, 95%CI: 1.0–9.0), presence of ≥2 underlying diseases (ORAdj=8.7, 95% CI: 3.1–24.2), family income <10,000 baht/month (ORAdj=2.9, 95% CI: 1.4–6.1), infiltration in ≥2 locations (ORAdj=25.6, 95% CI: 9.5–56.1), infiltration and atelectasis (ORAdj=17.5, 95% CI: 2.7–43.4), and nosocomial infection (ORAdj=35.5, 95% CI: 13.1–56.3). Clinical respiratory score (CRS) ≥ 6 tended to be a predictor for mechanical ventilation. Conclusion: age <3 months, Preterm, multiple underlying diseases, low socioeconomic status, chest radiographic infiltration in ≥2 locations, infiltration and atelectasis, and nosocomial infection were significant risk factors for severe RSV-LRTI in children under five years. Demographic data, early clinical assessment, CRS, CXR and monitoring are essential to reduce disease severity.
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